Elevator



(No Model.)

T. W. HBERMANS. ELEVATOR.

PatentedSepLB, 1896.

9 g wawa PATENT FFICE.

THADDEUS WV. HEERMAN$, OF EVANSTQN, ILLINOIS.

ELEVATO R.

SPECIFICATION forming part of Letters Patent No. 567,541, dated September 8, 1896. Application filed December 80, 1895) Serial No. 573,802. a (No model.)

To all whom it may concern:

Be it known that I, THADDEUS W. HEER- MANS, a citizen of the United States, residing at Evanston, in the county of (Jock and State of Illinois, have invented a new and useful Improvement in Elevators, of which the following is a specification.

This invention relates to improvements in elevators of the class driven by electric motors.

The invention consists in substantially the construction set forth in the subjoined specification, illustrated in the drawings, and more particularly pointed out in the claims.

The invention is an improvement upon that set forth in my Patent No. 551,545, dated December 17, 1895.

Like letters refer to similar parts in both figures of the drawings, in which- Figure 1 is a side elevation of the carriage and hoisting-cable and screw, with a motor in vertical section. Fig. 2 is a cross-section of the screw and splined frame.

In the drawings, A designates the car or cage of an elevator, which may be adapted to carry passengers or freight, and inasmuch as the construction of such cage is well known to those skilled in the art no detailed description is here required, and a mere outline of such a cage is all that is necessary to be illustrated. This cage is suspended by a cable 13, which passes over suitable guide-sheaves C, and under a motor-sheave D, and then up to the framework M of the building above the elevator-well, where it is suitably secured at the point 0. The elevator-car is of course guided by suitable ways formed in the elevator-well for that purpose after the usual manner. The sheave D is secured to the top of a screw E, which may be of any desired length, but is preferably of a length equal to half of the travel of the cage, and is shown in-the drawings as arranged relatively to the cables and sheaves for that length. The screw is designed to be positively driven in each direction by a nut operated by a suitable motor, and preferably an electric motor, as will be more fully set forth. The lower end of the screw may have secured thereto a weight F to act as a counterbalance for the car or cage.

G, G, G and G designate the various portions of a suitably-constructed frame for supporting themotor and cooperating parts, and these several parts of the motor-frame may be bolted or-otherwise secured together.

A sleeve K loosely incloses a portion of the screw and has a bearing in the motor-frame in such a manner that it may freely rotate therein,and is constructed with suitable shoulders extending therefrom laterally at proper points for the purpose of taking up end thrust which may be given such sleeve by operation of the screw and to fix such nut against longitudinal movement. In the frame are mounted the field-magnets H H of an electric motor,

and between such magnets is placed the armature P, which latter is secured to the sleeve K and rotates such sleeve. Bolted or other wise attached to the lower end of the sleeve is an elongated nut I, the internal threads of which mesh with the threads of the screw and thereby cause the screw to be reciprocated. Rotary movement of the screw is prevented by a feather or spline R of the frame engaging a vertical slot in such screw.

The operation of the machine maybe briefly stated as follows: The nut I is rotated by the sleeve, which in turn receives rotation from the armature secured thereto, and said armature is rotated by the field-magnets in the usual way. The screw is engaged by the nut and thereby given a vertical movement, the rotary movement thereof being prevented by the spline. The vertical movement of the screw causes a similar movement of the car or cage, and the weight of the latter and the weight at the lower end of the screw counterbalance each other.

Various modifications of the constructions illustrated and heretofore described may be made without departing from the principle ofthe invention, and I therefore do not Wish to be understood as limiting details set forth.

What I claim, and desire to secure by LettersPatent of the United States, is-

, 1. In an elevator mechanism, the combina tion with a car, of a screw, flexible means connecting the car and screw, a motor-frame, a sleeve journaled in such frame and fixed myself to the against longitudinal movement and carrying a nut for engaging the screw, and an electric -motor having its field-magnets surround the sleeve and its armature secured thereto, substantially as and for the purpose set forth.

movement, a nut secured to one end of said sleeve, and anarmature secured to another 15 portion of said sleeve and adapted to rotate the same, substantially as and for the purpose set forth.

In Witness whereof I have hereunto set my hand, this 27th day of December, 1895, in the 20 presence of two witnesses.

THADDEUS WV. HEERMANS.

Witnesses:

FRANK T. BROWN, M. O. KEARNEY. 

